MFC r288579: Restore original array_rd_sz semantics.
Before r278702 prefetch was blocked for I/Os > 1MB, after -- >= 1MB.
1MB I/Os are used for bulk operations in CTL (XCOPY, VERIFY), and disabling
prefetch for them reduced the performance.
MFC r288579: Restore original array_rd_sz semantics. Tags None Referenced Files None Subscribers None
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